curl --request POST \
  --url https://api.anysite.io/api/substack/posts \
  --header 'Content-Type: application/json' \
  --header 'access-token: <api-key>' \
  --data '
{
  "publication": "<string>",
  "post": "<string>",
  "timeout": 300
}
'

[
  {
    "id": 123,
    "@type": "@substack_post",
    "alias": "<string>",
    "title": "<string>",
    "subtitle": "<string>",
    "description": "<string>",
    "text": "<string>",
    "published_at": "<string>",
    "updated_at": "<string>",
    "canonical_url": "<string>",
    "publication_id": 123,
    "language": "<string>",
    "word_count": 123,
    "reaction_count": 123,
    "reactions": {},
    "comment_count": 123,
    "child_comment_count": 123,
    "restack_count": 123,
    "image": "<string>",
    "authors": [],
    "tags": [],
    "has_voiceover": true,
    "podcast_url": "<string>",
    "podcast_duration": 123,
    "podcast_image": "<string>",
    "podcast_episode_number": 123,
    "podcast_season_number": 123,
    "is_paywalled": true
  }
]